Manley, John F., author
Macmillan, 1976
Buku Teks
Moore, John A.
Macmillan Publishing Company, 1985
Buku Teks
by James W. Ceaser ... [and others]
McGraw-Hill , 1984
Buku Teks
Kraft, Joseph
The New American Library, 1966
Buku Teks
White, Leonard D., author
Macmillan, 1955
Buku Teks